package com.gongyi.sync.safe;

//安全的取钱
//两个人去银行取钱，账户
public class SafeBank {
    public static void main(String[] args) {
        //账户
        Account account = new Account(100, "结婚基金");

        Drawing you = new Drawing(account, 50, "你");
        Drawing girlFriend = new Drawing(account, 100, "girlFriend");

        you.start();
        girlFriend.start();
    }
}


//账户
class Account {
    int money;//余额
    String name;//卡名

    public Account(int money, String name) {
        this.money = money;
        this.name = name;
    }
}

//银行：模拟取款
class Drawing extends Thread {
    Account account;//账户
    int drawingMoney;//取了多少钱
    int nowMoney;//现在手里有多少钱

    public Drawing(Account account, int drawingMoney, String name) {
        super(name);
        this.account = account;
        this.drawingMoney = drawingMoney;

    }

    //取钱
    // synchronized 默认锁的是this，在这里加不影响账户
    @Override
    //public synchronized void run() {
    public void run() {
        //synchronized (this) {//无用，锁银行无用，要锁账户，变化的量

        //锁的对象就是变化的量，需要增删改的对象
        synchronized (account) {
            //判断有没有钱
            if (account.money - drawingMoney < 0) {
                System.out.println(Thread.currentThread().getName() + "钱不够，取不了");
                return;
            }

            //sleep可以放大问题的发生性
            try {
                Thread.sleep(10000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            //卡内余额=余额-你取的钱
            account.money = account.money - drawingMoney;
            //你手里的钱
            nowMoney = nowMoney + drawingMoney;
            System.out.println(account.name + "余额为:" + account.money);
            //Thread.currentThread().getName() =this.getName();
            System.out.println(this.getName() + "手里的钱:" + nowMoney);

        }

    }
}
